Sorry dude, I don't know too much about creating familiars. But I would imagine you would just look at the spell structure of the spell Find Familiar and substitute the graphic of a golem. I'm sure it's not as easy as it sounds as there are a number of movement sets (walking/attacking etc). Jon the Hell Caster should be able to help you, you can find his website here. He's put up a walkthrough on how to make custom spells. Either him or Holy Mage Wah are our resident hackers. Hope you don't mind the plug, Jon...

Contrary to all these wild rumors I don't know the answer to EVERYTHING